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Zimbabwean President Robert Mugabe clung to the vestiges of office on Sunday, using a TV address to maintain he was still in power despite a military takeover and a mounting clamour for his autocratic 37-year rule to end.

"The (ruling ZANU-PF) party congress is due in a few weeks and I will preside over its processes," Mugabe said, pitching the country into deep uncertainty.

Many Zimbabweans had expected Mugabe, 93, to announce his resignation after the army seized power, opened the floodgates of citizen protest and his once-loyal party told him to quit.

But Mugabe, sitting alongside the uniformed generals who were behind the , delivered a speech that conveyed he was unruffled by the turmoil.

Speaking slowly and occasionally stumbling as he read from the pages, Mugabe talked of the need for solidarity to resolve national problems - business-as-usual rhetoric that he has deployed over decades.

He made no reference to the chorus for him to resign and shrugged off last week's dramatic military intervention.

"The operation I have alluded to did not amount to a threat to our well-cherished constitutional order nor did it challenge my authority as head of state, not even as commander in chief," he said.

Instead he urged harmony and comradeship.

"Whatever the pros and cons of how they (the army) went about their operation, I... do acknowledge their concerns," said Mugabe.

"We must learn to forgive and resolve contradictions, real or perceived, in a comradely Zimbabwean spirit."

Immediate anger

His address provoked immediate anger, and raised concerns that Zimbabwe could be at risk of a violent reaction to the political turmoil.

"That speech has nothing to do with realities. We will go for impeachment and we are calling people back to the streets," Chris Mutsvangwa, head of the influential war veterans' association, told AFP.

A ZANU-PF party meeting earlier in Harare agreed that "Mugabe resign forthwith from his position as president of Zimbabwe" by midday Monday or face impeachment proceedings.

Party spokesman Simon Khaya Moyo added that Mugabe's wife Grace "is on the list of people to be expelled from the party".

On Saturday, in scenes of public elation not seen since Zimbabwe's independence in 1980, huge crowds had marched and sang their way through Harare, believing Mugabe was about to step down.

The majority of Zimbabweans have only known life under Mugabe - the world's oldest head of state - during a reign defined by violent suppression, economic collapse and international isolation.

Sources suggest Mugabe has been battling to delay his exit and to secure a deal guaranteeing future protection for him and his family.

The president, who is feted in parts of Africa as the continent's last surviving independence leader, is in fragile health.

But he previously said he would stand in elections next year that would see him remain in power until he was nearly 100 years old.

He became prime minister on Zimbabwe's independence from Britain in 1980 and then president in 1987.

Zimbabwe's economic output has halved since 2000 when many white-owned farms were seized, leaving the key agricultural sector in ruins.